Ellipse Area Calculator
From Semi-Axes
From Area & Semi-Major Axis
Formula
A = pi*a*b | P ~ pi(a+b)(1+3h/(10+sqrt(4-3h))) | e = c/a where c = sqrt(a^2-b^2)
Frequently Asked Questions
How do you calculate the area of an ellipse?
Area = pi * a * b, where a is the semi-major axis and b is the semi-minor axis. When a = b, this reduces to pi*r^2 for a circle.
How do you approximate the perimeter of an ellipse?
There is no exact closed-form formula. Ramanujans approximation is: P ~ pi(a+b)(1 + 3h/(10+sqrt(4-3h))), where h = ((a-b)/(a+b))^2.